TDD/Test doubles
- Test doubles
- Traditionally, there are five types of test doubles:
- Dummies: Types without any behavior at all, provided only because the signature of the unit under test requires them.
- Stubs: Types implementing the minimum amount of behavior to satisfy a test.
- Mocks: Partial implementations for which you can define expectations on how their methods will be called.
- Spies: Partial implementations on which you can assert that specific methods have been called.
- Fakes: Full, lightweight implementations such as in-memory databases.
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